This stuff works so well! I bought it to fix a tear in the canvas of our popup camper. Our first trip out, it POURED on us for over a day and it held strong without a single leak. I then used the left over to patch an water toy. I thought for sure it wouldn't last long, especially since it was constantly saturated, but it not only held through multiple kids jumping on it. I plan to keep a stash of this stuff around the house.